1 | // |
---|
2 | // ******************************************************************** |
---|
3 | // * License and Disclaimer * |
---|
4 | // * * |
---|
5 | // * The Geant4 software is copyright of the Copyright Holders of * |
---|
6 | // * the Geant4 Collaboration. It is provided under the terms and * |
---|
7 | // * conditions of the Geant4 Software License, included in the file * |
---|
8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
---|
9 | // * include a list of copyright holders. * |
---|
10 | // * * |
---|
11 | // * Neither the authors of this software system, nor their employing * |
---|
12 | // * institutes,nor the agencies providing financial support for this * |
---|
13 | // * work make any representation or warranty, express or implied, * |
---|
14 | // * regarding this software system or assume any liability for its * |
---|
15 | // * use. Please see the license in the file LICENSE and URL above * |
---|
16 | // * for the full disclaimer and the limitation of liability. * |
---|
17 | // * * |
---|
18 | // * This code implementation is the result of the scientific and * |
---|
19 | // * technical work of the GEANT4 collaboration. * |
---|
20 | // * By using, copying, modifying or distributing the software (or * |
---|
21 | // * any work based on the software) you agree to acknowledge its * |
---|
22 | // * use in resulting scientific publications, and indicate your * |
---|
23 | // * acceptance of all terms of the Geant4 Software license. * |
---|
24 | // ******************************************************************** |
---|
25 | // |
---|
26 | // $Id: G4HEKaonPlusInelastic.cc,v 1.16 2010/11/29 05:44:44 dennis Exp $ |
---|
27 | // GEANT4 tag $Name: geant4-09-04-ref-00 $ |
---|
28 | // |
---|
29 | |
---|
30 | #include "globals.hh" |
---|
31 | #include "G4ios.hh" |
---|
32 | |
---|
33 | // G4 Process: Gheisha High Energy Collision model. |
---|
34 | // This includes the high energy cascading model, the two-body-resonance model |
---|
35 | // and the low energy two-body model. Not included are the low energy stuff |
---|
36 | // like nuclear reactions, nuclear fission without any cascading and all |
---|
37 | // processes for particles at rest. |
---|
38 | // First work done by J.L.Chuma and F.W.Jones, TRIUMF, June 96. |
---|
39 | // H. Fesefeldt, RWTH-Aachen, 23-October-1996 |
---|
40 | // Last modified: 29-July-1998 |
---|
41 | |
---|
42 | #include "G4HEKaonPlusInelastic.hh" |
---|
43 | |
---|
44 | G4HadFinalState* |
---|
45 | G4HEKaonPlusInelastic::ApplyYourself(const G4HadProjectile& aTrack, |
---|
46 | G4Nucleus& targetNucleus) |
---|
47 | { |
---|
48 | G4HEVector* pv = new G4HEVector[MAXPART]; |
---|
49 | const G4HadProjectile* aParticle = &aTrack; |
---|
50 | const G4double A = targetNucleus.GetN(); |
---|
51 | const G4double Z = targetNucleus.GetZ(); |
---|
52 | G4HEVector incidentParticle(aParticle); |
---|
53 | |
---|
54 | G4double atomicNumber = Z; |
---|
55 | G4double atomicWeight = A; |
---|
56 | |
---|
57 | G4int incidentCode = incidentParticle.getCode(); |
---|
58 | G4double incidentMass = incidentParticle.getMass(); |
---|
59 | G4double incidentTotalEnergy = incidentParticle.getEnergy(); |
---|
60 | G4double incidentTotalMomentum = incidentParticle.getTotalMomentum(); |
---|
61 | G4double incidentKineticEnergy = incidentTotalEnergy - incidentMass; |
---|
62 | |
---|
63 | if (incidentKineticEnergy < 1.) |
---|
64 | G4cout << "GHEKaonPlusInelastic: incident energy < 1 GeV" << G4endl; |
---|
65 | |
---|
66 | if (verboseLevel > 1) { |
---|
67 | G4cout << "G4HEKaonPlusInelastic::ApplyYourself" << G4endl; |
---|
68 | G4cout << "incident particle " << incidentParticle.getName() |
---|
69 | << "mass " << incidentMass |
---|
70 | << "kinetic energy " << incidentKineticEnergy |
---|
71 | << G4endl; |
---|
72 | G4cout << "target material with (A,Z) = (" |
---|
73 | << atomicWeight << "," << atomicNumber << ")" << G4endl; |
---|
74 | } |
---|
75 | |
---|
76 | G4double inelasticity = NuclearInelasticity(incidentKineticEnergy, |
---|
77 | atomicWeight, atomicNumber); |
---|
78 | if (verboseLevel > 1) |
---|
79 | G4cout << "nuclear inelasticity = " << inelasticity << G4endl; |
---|
80 | |
---|
81 | incidentKineticEnergy -= inelasticity; |
---|
82 | |
---|
83 | G4double excitationEnergyGNP = 0.; |
---|
84 | G4double excitationEnergyDTA = 0.; |
---|
85 | |
---|
86 | G4double excitation = NuclearExcitation(incidentKineticEnergy, |
---|
87 | atomicWeight, atomicNumber, |
---|
88 | excitationEnergyGNP, |
---|
89 | excitationEnergyDTA); |
---|
90 | if (verboseLevel > 1) |
---|
91 | G4cout << "nuclear excitation = " << excitation << excitationEnergyGNP |
---|
92 | << excitationEnergyDTA << G4endl; |
---|
93 | |
---|
94 | incidentKineticEnergy -= excitation; |
---|
95 | incidentTotalEnergy = incidentKineticEnergy + incidentMass; |
---|
96 | incidentTotalMomentum = std::sqrt( (incidentTotalEnergy-incidentMass) |
---|
97 | *(incidentTotalEnergy+incidentMass)); |
---|
98 | |
---|
99 | G4HEVector targetParticle; |
---|
100 | |
---|
101 | if (G4UniformRand() < atomicNumber/atomicWeight) { |
---|
102 | targetParticle.setDefinition("Proton"); |
---|
103 | } else { |
---|
104 | targetParticle.setDefinition("Neutron"); |
---|
105 | } |
---|
106 | |
---|
107 | G4double targetMass = targetParticle.getMass(); |
---|
108 | G4double centerOfMassEnergy = std::sqrt(incidentMass*incidentMass |
---|
109 | + targetMass*targetMass |
---|
110 | + 2.0*targetMass*incidentTotalEnergy); |
---|
111 | G4double availableEnergy = centerOfMassEnergy - targetMass - incidentMass; |
---|
112 | |
---|
113 | G4bool inElastic = true; |
---|
114 | vecLength = 0; |
---|
115 | |
---|
116 | if (verboseLevel > 1) |
---|
117 | G4cout << "ApplyYourself: CallFirstIntInCascade for particle " |
---|
118 | << incidentCode << G4endl; |
---|
119 | |
---|
120 | G4bool successful = false; |
---|
121 | |
---|
122 | FirstIntInCasKaonPlus(inElastic, availableEnergy, pv, vecLength, |
---|
123 | incidentParticle, targetParticle, atomicWeight); |
---|
124 | |
---|
125 | if (verboseLevel > 1) |
---|
126 | G4cout << "ApplyYourself::StrangeParticlePairProduction" << G4endl; |
---|
127 | |
---|
128 | if ((vecLength > 0) && (availableEnergy > 1.)) |
---|
129 | StrangeParticlePairProduction(availableEnergy, centerOfMassEnergy, |
---|
130 | pv, vecLength, |
---|
131 | incidentParticle, targetParticle); |
---|
132 | |
---|
133 | HighEnergyCascading(successful, pv, vecLength, |
---|
134 | excitationEnergyGNP, excitationEnergyDTA, |
---|
135 | incidentParticle, targetParticle, |
---|
136 | atomicWeight, atomicNumber); |
---|
137 | if (!successful) |
---|
138 | HighEnergyClusterProduction(successful, pv, vecLength, |
---|
139 | excitationEnergyGNP, excitationEnergyDTA, |
---|
140 | incidentParticle, targetParticle, |
---|
141 | atomicWeight, atomicNumber); |
---|
142 | if (!successful) |
---|
143 | MediumEnergyCascading(successful, pv, vecLength, |
---|
144 | excitationEnergyGNP, excitationEnergyDTA, |
---|
145 | incidentParticle, targetParticle, |
---|
146 | atomicWeight, atomicNumber); |
---|
147 | |
---|
148 | if (!successful) |
---|
149 | MediumEnergyClusterProduction(successful, pv, vecLength, |
---|
150 | excitationEnergyGNP, excitationEnergyDTA, |
---|
151 | incidentParticle, targetParticle, |
---|
152 | atomicWeight, atomicNumber); |
---|
153 | if (!successful) |
---|
154 | QuasiElasticScattering(successful, pv, vecLength, |
---|
155 | excitationEnergyGNP, excitationEnergyDTA, |
---|
156 | incidentParticle, targetParticle, |
---|
157 | atomicWeight, atomicNumber); |
---|
158 | if (!successful) |
---|
159 | ElasticScattering(successful, pv, vecLength, |
---|
160 | incidentParticle, |
---|
161 | atomicWeight, atomicNumber); |
---|
162 | |
---|
163 | if (!successful) |
---|
164 | G4cout << "GHEInelasticInteraction::ApplyYourself fails to produce final state particles" |
---|
165 | << G4endl; |
---|
166 | |
---|
167 | FillParticleChange(pv, vecLength); |
---|
168 | delete [] pv; |
---|
169 | theParticleChange.SetStatusChange(stopAndKill); |
---|
170 | return &theParticleChange; |
---|
171 | } |
---|
172 | |
---|
173 | |
---|
174 | void |
---|
175 | G4HEKaonPlusInelastic::FirstIntInCasKaonPlus(G4bool& inElastic, |
---|
176 | const G4double availableEnergy, |
---|
177 | G4HEVector pv[], |
---|
178 | G4int& vecLen, |
---|
179 | const G4HEVector& incidentParticle, |
---|
180 | const G4HEVector& targetParticle, |
---|
181 | const G4double atomicWeight) |
---|
182 | |
---|
183 | // Kaon+ undergoes interaction with nucleon within a nucleus. Check if it is |
---|
184 | // energetically possible to produce pions/kaons. In not, assume nuclear excitation |
---|
185 | // occurs and input particle is degraded in energy. No other particles are produced. |
---|
186 | // If reaction is possible, find the correct number of pions/protons/neutrons |
---|
187 | // produced using an interpolation to multiplicity data. Replace some pions or |
---|
188 | // protons/neutrons by kaons or strange baryons according to the average |
---|
189 | // multiplicity per inelastic reaction. |
---|
190 | { |
---|
191 | static const G4double expxu = std::log(MAXFLOAT); // upper bound for arg. of exp |
---|
192 | static const G4double expxl = -expxu; // lower bound for arg. of exp |
---|
193 | |
---|
194 | static const G4double protb = 0.7; |
---|
195 | static const G4double neutb = 0.7; |
---|
196 | static const G4double c = 1.25; |
---|
197 | |
---|
198 | static const G4int numMul = 1200; |
---|
199 | static const G4int numSec = 60; |
---|
200 | |
---|
201 | G4int neutronCode = Neutron.getCode(); |
---|
202 | G4int protonCode = Proton.getCode(); |
---|
203 | |
---|
204 | G4int targetCode = targetParticle.getCode(); |
---|
205 | G4double incidentTotalMomentum = incidentParticle.getTotalMomentum(); |
---|
206 | |
---|
207 | static G4bool first = true; |
---|
208 | static G4double protmul[numMul], protnorm[numSec]; // proton constants |
---|
209 | static G4double neutmul[numMul], neutnorm[numSec]; // neutron constants |
---|
210 | |
---|
211 | // misc. local variables |
---|
212 | // np = number of pi+, nm = number of pi-, nz = number of pi0 |
---|
213 | |
---|
214 | G4int i, counter, nt, np, nm, nz; |
---|
215 | |
---|
216 | if( first ) |
---|
217 | { // compute normalization constants, this will only be done once |
---|
218 | first = false; |
---|
219 | for( i=0; i<numMul; i++ )protmul[i] = 0.0; |
---|
220 | for( i=0; i<numSec; i++ )protnorm[i] = 0.0; |
---|
221 | counter = -1; |
---|
222 | for( np=0; np<(numSec/3); np++ ) |
---|
223 | { |
---|
224 | for( nm=Imax(0,np-2); nm<=np; nm++ ) |
---|
225 | { |
---|
226 | for( nz=0; nz<numSec/3; nz++ ) |
---|
227 | { |
---|
228 | if( ++counter < numMul ) |
---|
229 | { |
---|
230 | nt = np+nm+nz; |
---|
231 | if( (nt>0) && (nt<=numSec) ) |
---|
232 | { |
---|
233 | protmul[counter] = |
---|
234 | pmltpc(np,nm,nz,nt,protb,c) ; |
---|
235 | protnorm[nt-1] += protmul[counter]; |
---|
236 | } |
---|
237 | } |
---|
238 | } |
---|
239 | } |
---|
240 | } |
---|
241 | for( i=0; i<numMul; i++ )neutmul[i] = 0.0; |
---|
242 | for( i=0; i<numSec; i++ )neutnorm[i] = 0.0; |
---|
243 | counter = -1; |
---|
244 | for( np=0; np<numSec/3; np++ ) |
---|
245 | { |
---|
246 | for( nm=Imax(0,np-1); nm<=(np+1); nm++ ) |
---|
247 | { |
---|
248 | for( nz=0; nz<numSec/3; nz++ ) |
---|
249 | { |
---|
250 | if( ++counter < numMul ) |
---|
251 | { |
---|
252 | nt = np+nm+nz; |
---|
253 | if( (nt>0) && (nt<=numSec) ) |
---|
254 | { |
---|
255 | neutmul[counter] = |
---|
256 | pmltpc(np,nm,nz,nt,neutb,c); |
---|
257 | neutnorm[nt-1] += neutmul[counter]; |
---|
258 | } |
---|
259 | } |
---|
260 | } |
---|
261 | } |
---|
262 | } |
---|
263 | for( i=0; i<numSec; i++ ) |
---|
264 | { |
---|
265 | if( protnorm[i] > 0.0 )protnorm[i] = 1.0/protnorm[i]; |
---|
266 | if( neutnorm[i] > 0.0 )neutnorm[i] = 1.0/neutnorm[i]; |
---|
267 | } |
---|
268 | } // end of initialization |
---|
269 | |
---|
270 | |
---|
271 | // initialize the first two places |
---|
272 | // the same as beam and target |
---|
273 | pv[0] = incidentParticle; |
---|
274 | pv[1] = targetParticle; |
---|
275 | vecLen = 2; |
---|
276 | |
---|
277 | if( !inElastic ) |
---|
278 | { // quasi-elastic scattering, no pions produced |
---|
279 | if( targetCode == neutronCode ) |
---|
280 | { |
---|
281 | G4double cech[] = {0.33,0.27,0.29,0.31,0.27,0.18,0.13,0.10,0.09,0.07}; |
---|
282 | G4int iplab = G4int( Amin( 9.0, incidentTotalMomentum*5. ) ); |
---|
283 | if( G4UniformRand() < cech[iplab]/std::pow(atomicWeight,0.42) ) |
---|
284 | { // charge exchange K+ n -> K0 p |
---|
285 | pv[0] = KaonZero; |
---|
286 | pv[1] = Proton; |
---|
287 | } |
---|
288 | } |
---|
289 | return; |
---|
290 | } |
---|
291 | else if (availableEnergy <= PionPlus.getMass()) |
---|
292 | return; |
---|
293 | |
---|
294 | // inelastic scattering |
---|
295 | |
---|
296 | np = 0, nm = 0, nz = 0; |
---|
297 | G4double eab = availableEnergy; |
---|
298 | G4int ieab = G4int( eab*5.0 ); |
---|
299 | |
---|
300 | G4double supp[] = {0., 0.4, 0.55, 0.65, 0.75, 0.82, 0.86, 0.90, 0.94, 0.98}; |
---|
301 | if( (ieab <= 9) && (G4UniformRand() >= supp[ieab]) ) |
---|
302 | { |
---|
303 | // suppress high multiplicity events at low momentum |
---|
304 | // only one additional pion will be produced |
---|
305 | G4double w0, wp, wm, wt, ran; |
---|
306 | if( targetCode == protonCode ) // target is a proton |
---|
307 | { |
---|
308 | w0 = - sqr(1.+protb)/(2.*c*c); |
---|
309 | wp = w0 = std::exp(w0); |
---|
310 | wp *= 2.; |
---|
311 | if( G4UniformRand() < w0/(w0+wp) ) |
---|
312 | { np = 0; nm = 0; nz = 1; } |
---|
313 | else |
---|
314 | { np = 1; nm = 0; nz = 0; } |
---|
315 | } |
---|
316 | else |
---|
317 | { // target is a neutron |
---|
318 | w0 = -sqr(1.+neutb)/(2.*c*c); |
---|
319 | wp = w0 = std::exp(w0); |
---|
320 | wm = -sqr(-1.+neutb)/(2.*c*c); |
---|
321 | wm = std::exp(wm); |
---|
322 | wt = w0+wp+wm; |
---|
323 | wp = w0+wp; |
---|
324 | ran = G4UniformRand(); |
---|
325 | if( ran < w0/wt) |
---|
326 | { np = 0; nm = 0; nz = 1; } |
---|
327 | else if( ran < wp/wt) |
---|
328 | { np = 1; nm = 0; nz = 0; } |
---|
329 | else |
---|
330 | { np = 0; nm = 1; nz = 0; } |
---|
331 | } |
---|
332 | } |
---|
333 | else |
---|
334 | { |
---|
335 | // number of total particles vs. centre of mass Energy - 2*proton mass |
---|
336 | |
---|
337 | G4double aleab = std::log(availableEnergy); |
---|
338 | G4double n = 3.62567+aleab*(0.665843+aleab*(0.336514 |
---|
339 | + aleab*(0.117712+0.0136912*aleab))) - 2.0; |
---|
340 | |
---|
341 | // normalization constant for kno-distribution. |
---|
342 | // calculate first the sum of all constants, check for numerical problems. |
---|
343 | G4double test, dum, anpn = 0.0; |
---|
344 | |
---|
345 | for (nt=1; nt<=numSec; nt++) { |
---|
346 | test = std::exp( Amin( expxu, Amax( expxl, -(pi/4.0)*(nt*nt)/(n*n) ) ) ); |
---|
347 | dum = pi*nt/(2.0*n*n); |
---|
348 | if (std::fabs(dum) < 1.0) { |
---|
349 | if( test >= 1.0e-10 )anpn += dum*test; |
---|
350 | } else { |
---|
351 | anpn += dum*test; |
---|
352 | } |
---|
353 | } |
---|
354 | |
---|
355 | G4double ran = G4UniformRand(); |
---|
356 | G4double excs = 0.0; |
---|
357 | if( targetCode == protonCode ) |
---|
358 | { |
---|
359 | counter = -1; |
---|
360 | for( np=0; np<numSec/3; np++ ) |
---|
361 | { |
---|
362 | for( nm=Imax(0,np-2); nm<=np; nm++ ) |
---|
363 | { |
---|
364 | for (nz=0; nz<numSec/3; nz++) { |
---|
365 | if (++counter < numMul) { |
---|
366 | nt = np+nm+nz; |
---|
367 | if ( (nt>0) && (nt<=numSec) ) { |
---|
368 | test = std::exp( Amin( expxu, Amax( expxl, -(pi/4.0)*(nt*nt)/(n*n) ) ) ); |
---|
369 | dum = (pi/anpn)*nt*protmul[counter]*protnorm[nt-1]/(2.0*n*n); |
---|
370 | if (std::fabs(dum) < 1.0) { |
---|
371 | if( test >= 1.0e-10 )excs += dum*test; |
---|
372 | } else { |
---|
373 | excs += dum*test; |
---|
374 | } |
---|
375 | if (ran < excs) goto outOfLoop; //-----------------------> |
---|
376 | } |
---|
377 | } |
---|
378 | } |
---|
379 | } |
---|
380 | } |
---|
381 | |
---|
382 | // 3 previous loops continued to the end |
---|
383 | inElastic = false; // quasi-elastic scattering |
---|
384 | return; |
---|
385 | } |
---|
386 | else |
---|
387 | { // target must be a neutron |
---|
388 | counter = -1; |
---|
389 | for( np=0; np<numSec/3; np++ ) |
---|
390 | { |
---|
391 | for( nm=Imax(0,np-1); nm<=(np+1); nm++ ) |
---|
392 | { |
---|
393 | for (nz=0; nz<numSec/3; nz++) { |
---|
394 | if (++counter < numMul) { |
---|
395 | nt = np+nm+nz; |
---|
396 | if ( (nt>=1) && (nt<=numSec) ) { |
---|
397 | test = std::exp( Amin( expxu, Amax( expxl, -(pi/4.0)*(nt*nt)/(n*n) ) ) ); |
---|
398 | dum = (pi/anpn)*nt*neutmul[counter]*neutnorm[nt-1]/(2.0*n*n); |
---|
399 | if (std::fabs(dum) < 1.0) { |
---|
400 | if( test >= 1.0e-10 )excs += dum*test; |
---|
401 | } else { |
---|
402 | excs += dum*test; |
---|
403 | } |
---|
404 | if (ran < excs) goto outOfLoop; // --------------------------> |
---|
405 | } |
---|
406 | } |
---|
407 | } |
---|
408 | } |
---|
409 | } |
---|
410 | // 3 previous loops continued to the end |
---|
411 | inElastic = false; // quasi-elastic scattering. |
---|
412 | return; |
---|
413 | } |
---|
414 | } |
---|
415 | outOfLoop: // <------------------------------------------------------------------------ |
---|
416 | |
---|
417 | if( targetCode == protonCode) |
---|
418 | { |
---|
419 | if( np == nm) |
---|
420 | { |
---|
421 | } |
---|
422 | else if (np == (1+nm)) |
---|
423 | { |
---|
424 | if( G4UniformRand() < 0.5) |
---|
425 | { |
---|
426 | pv[1] = Neutron; |
---|
427 | } |
---|
428 | else |
---|
429 | { |
---|
430 | pv[0] = KaonZero; |
---|
431 | } |
---|
432 | } |
---|
433 | else |
---|
434 | { |
---|
435 | pv[0] = KaonZero; |
---|
436 | pv[1] = Neutron; |
---|
437 | } |
---|
438 | } |
---|
439 | else |
---|
440 | { |
---|
441 | if( np == nm) |
---|
442 | { |
---|
443 | if( G4UniformRand() < 0.25) |
---|
444 | { |
---|
445 | pv[0] = KaonZero; |
---|
446 | pv[1] = Proton; |
---|
447 | } |
---|
448 | else |
---|
449 | { |
---|
450 | } |
---|
451 | } |
---|
452 | else if ( np == (1+nm)) |
---|
453 | { |
---|
454 | pv[0] = KaonZero; |
---|
455 | } |
---|
456 | else |
---|
457 | { |
---|
458 | pv[1] = Proton; |
---|
459 | } |
---|
460 | } |
---|
461 | |
---|
462 | |
---|
463 | nt = np + nm + nz; |
---|
464 | while ( nt > 0) |
---|
465 | { |
---|
466 | G4double ran = G4UniformRand(); |
---|
467 | if ( ran < (G4double)np/nt) |
---|
468 | { |
---|
469 | if( np > 0 ) |
---|
470 | { pv[vecLen++] = PionPlus; |
---|
471 | np--; |
---|
472 | } |
---|
473 | } |
---|
474 | else if ( ran < (G4double)(np+nm)/nt) |
---|
475 | { |
---|
476 | if( nm > 0 ) |
---|
477 | { |
---|
478 | pv[vecLen++] = PionMinus; |
---|
479 | nm--; |
---|
480 | } |
---|
481 | } |
---|
482 | else |
---|
483 | { |
---|
484 | if( nz > 0 ) |
---|
485 | { |
---|
486 | pv[vecLen++] = PionZero; |
---|
487 | nz--; |
---|
488 | } |
---|
489 | } |
---|
490 | nt = np + nm + nz; |
---|
491 | } |
---|
492 | if (verboseLevel > 1) |
---|
493 | { |
---|
494 | G4cout << "Particles produced: " ; |
---|
495 | G4cout << pv[0].getName() << " " ; |
---|
496 | G4cout << pv[1].getName() << " " ; |
---|
497 | for (i=2; i < vecLen; i++) |
---|
498 | { |
---|
499 | G4cout << pv[i].getName() << " " ; |
---|
500 | } |
---|
501 | G4cout << G4endl; |
---|
502 | } |
---|
503 | return; |
---|
504 | } |
---|
505 | |
---|
506 | |
---|
507 | |
---|
508 | |
---|
509 | |
---|
510 | |
---|
511 | |
---|
512 | |
---|
513 | |
---|